[SalesForce] How to get organization’s namespace prefix or at least ALL namespace prefixes including org through any API

For synchronous testing: The RunTestsResult returned by calling ApexService.runTests() contains a codeCoverage property, which is a CodeCoverageResult array.

The CodeCoverageResult locationsNotCovered property gives you the line number and column of code that wasn't tested in the run.

My experience with this is that it will return code coverage results for any class that gets touched by the test case(s) and you don't get any control over it. Also, it isn't a cumulative view of the code coverage, only what is covered by that specific test run. So you can get lots of results indicating very low code coverage for classes that weren't being targeted by the test cases in the run but might otherwise have really good coverage.

Internally Salesforce appear to be tracking the results of previous tests runs. The Code coverage page https://na2.salesforce.com/setup/build/viewCodeCoverage.apexp?id=01p400000000XYZ has that drop box at the top that can toggle between previous run results. Sadly I've never been able to query this data programmatically. You can access this data via the Tooling API and the ApexCodeCoverage records.

I don't think it's possible to get the package name via the Metadata API. As you stated, you can get the namespace and the version, but not the name itself.

One thing you can do is verify that a package with name X is installed in the org. With the ant migration tool, you can attempt a retrieve of the package. If the package with that name (managed or unmanaged) does not exist in the org, you get an INVALID CROSS REFERENCE ID error on the package name.

  <sf:retrieve 
    username="${sf.username}" 
    password="${sf.password}" 
    serverurl="${sf.serverurl}" 
    retrieveTarget="packaged" 
    packageNames="PACKAGE_NAME_HERE"/>